Screw-plate.



0.1]. RUSSELL. SCREW PLATE.

APPLICATION FILED DBO.14, 1912.

Patented Sept. 30, 1913.

'UNIE snares PATENT ornica.

CHARLES C. RUSSELL, 0F GREENFIELD, MASSACHUSETTS.

SCREW-PLATE.

To all whom it may concern:

Be it known that I, GHARLns C. RUssnLL, a citizen of the United States,residing at Greenfield, in the county of Franklin and State ofMassachusetts, have invented certain new and useful Improvements inScrew- Plates; and I do hereby declare the following to be a full,clear, and exact description of the invention, such as will enableothers skilled in the art to which it appertains to make and use thesame.

My invention relates to screw plates, and it consists in theconstructions, combinations and arrangements herein described andclaimed.

The object of my invention is to provide an improved screw plate adaptedto be read ily opened upon the completion of a thread; thereby savingtime and avoiding wear on the dies and injury to the thread incident torunning the dies back over a completed thread.

In the accompanying drawings forming a part of this application and inwhich similar reference symbols indicate corresponding parts in theseveral views :-Figure 1 is a rear face view, partly broken away,illustrating one embodiment of my invention; Fig. 2 is a side view atthe left of Fig. 1; Fig. 3 is a side view at the right of Fig. 1; andFig. 4 is a detail axial section, on a reduced scale, through the guide,die members and stock.

Referring to the drawings, 1 and 2 indicate the two half-sections of astock, which are pivotally connected at 3 and provided with extensions 4and 5. A cam 6 is pivoted at 7 in the extension 4 in position to engagea hardened wear plate 8 on the extension 5, for forcing the two stocksections apart. The pivoted cam 6 is provided with a threaded shank 9adapted to swing through a slot 10 in the extension 5, and carrying athumb nut 11 for engaging the outer face of said extension 5 to firmlyclamp the stock sections together. A pair of die members 12 arerotatably secured on a guide 13 by a cup-headed screw 14, and a screw 15is threaded in said guide 13 and provided with a tapered head engagingbetween said die members for adjusting the latter. The guide 13 isseated on inward projections 19 on Specification of Letters Patent.

Application filed December 14, 1912.

Patented Sept. 30, 1913.

Serial No. 736,867.

the stock sections 1 and 2; said stock sections being provided with lugs17 engaging slots 18 in the peripheral surfaces of the die members 12,for swinging said die members about said securing screw 14E uponseparation of the stock sections.

It will be obvious that a split elastic or spring stock could besubstituted for the pivotally connected stock sections, and that a screwdevice could be employed for opening the stock.

I have illustrated and described preferred and satisfactoryconstructions, but changes could be made within the spirit and scope ofmy invention.

I claim 1. In a screw cutting device, a stock comprising separablesections, means for detachably clamping said sections together, a pairof die members hinged together, and means on said stock sections forengaging said die members to open the latter upon separation of saidstock sections.

2. In a screw cutting device, the combination of a stock comprisingseparable sections, means for detachably clamping said sectionstogether, a pair'of die members provided with peripheral slots andhinged together, a screw provided with a tapered head engaging betweensaid die members for adjusting the latter, and lugs on said stockengaging said slots in said die members for opening the latter uponseparation of said stock sections.

3. In a screw cutting device the combination of a stock comprisingseparable sections, means for detachably connecting said sectionstogether, a guide seated on said stock sections, a pair of diesrotatably secured on said guide, a screw threaded in said guide andprovided with a tapered head engaging between said die members foradjusting the latter, and means on said stock sections for engaging saiddie members to open the latter upon separation of said stock sections.

In testimony whereof, I affix my signature,

in presence of two witnesses.

CHARLES C. RUSSELL. WVitnesses: 7

AROHIBALD D. FLOWER, CHARLES W. NIMS.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. G.

